US 11,923,789 B2
Power converter
Yuusuke Kouno, Tokyo (JP); and Yoichi Morishima, Tokyo (JP)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (JP); and Toshiba Infrastructure Systems & Solutions Corporation, Kawasaki (JP)
Filed by KABUSHIKI KAISHA TOSHIBA, Tokyo (JP); and Toshiba Infrastructure Systems & Solutions Corporation, Kawasaki (JP)
Filed on Sep. 1, 2022, as Appl. No. 17/901,389.
Claims priority of application No. 2021-146868 (JP), filed on Sep. 9, 2021.
Prior Publication US 2023/0074852 A1, Mar. 9, 2023
Int. Cl. H02M 7/539 (2006.01)
CPC H02M 7/539 (2013.01) 12 Claims
OG exemplary drawing
 
1. A power converter comprising:
an inverter configured to selectively operate in an interconnected operation mode or an isolated operation mode and to convert DC power into AC power, wherein, in the interconnected operation mode, the inverter and a power grid are connected to an electric load, and, in the isolated operation mode, the inverter is connected to the elctric load and the power grid is electrically separated from the electric load due to an occurrence of an anomaly in the power grid; and
a controller,
wherein, in the isolated operation mode, the controller
detects a frequency difference and a phase difference between the AC power from the inverter and AC power from the power grid,
calculates, based on the frequency difference and the phase difference, an output frequency pattern to be used for synchronizing the AC power from inverter with the AC power from the power grid, and
controls, for switching from the isolated operation mode to the interconnected operation mode, a frequency of the AC power from the inverter based on the output frequency pattern.